Code-Reject（编码拒绝）和Protocol-Reject（协议拒绝）帧：当收到无效帧时，这些帧用来提供反馈信息。无效帧的产生主要是由于一个无法识别的LCP编码或一个损坏的协议标识产生的。
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There had been fears that Mr Bush would reject a UN-sponsored programme just as America has refused to ratify the Kyoto protocol whereby leading countries pledge to reduce their greenhouse gas emissions at least 5% below 1990 levels.
ECONOMIST: The G8 summit: Friendly environment | The
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